[Jason]

hmm I have found something on the internet :

12AWG Wire = good for 100amps +
14AWG Wire = good for 50-75amps+
16AWG Wire = good for 25-74amps.
18AWG Wire = good for 25amps.
20AWG Wire = good for 20amps.

so a 13AWG Wire should be good for 80amps+ I think..